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The concrete effect of strong vs. weak copyleft has yet to be tested in court. [26] Free-software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. The GNU General Public License is an example of a license implementing strong copyleft.
"Weak copyleft" licenses are generally used for the creation of software libraries, to allow other software to link to the library, and then be redistributed without the legal requirement for the work to be distributed under the library's copyleft license. Only changes to the weak-copylefted software itself become subject to the copyleft ...
Commercial distributors of Linux distributions (like Red Hat and Mandriva) might have had some ups and downs [citation needed] in finding a successful construction (or business model) for setting up such businesses, but in time it was shown to be possible [citation needed] to base a business on a commercial service surrounding a copylefted work.
Copyleft licenses (also known as "share-alike"), [46] require source code to be distributed with software and require the source code be made available under a similar license. [48] [49] Copyleft represents the farthest that reuse can be restricted while still being considered free software. [50]
The free software movement champions copyleft licensing schema (often pejoratively called "viral licenses"). In its strongest form, copyleft mandates that any works derived from copyleft-licensed software must also carry a copyleft license, so the license spreads from work to work like a computer virus might spread from machine to machine.
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 December 2024. Classified advertisements website Craigslist Inc. Logo used since 1995 Screenshot of the main page on January 26, 2008 Type of business Private Type of site Classifieds, forums Available in English, French, German, Dutch, Spanish, Italian, Portuguese Founded 1995 ; 29 years ago (1995 ...
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SA (share-alike): restriction on freedoms 2 or 3, the copy must distributed under a license identical to the license that governs the original work (see copyleft). ND (Non-derivative): exclusion of freedom 3. NC (Non-commercial): partial exclusion of freedoms 2 and 3 of commercial purposes. Other: other less usual restrictions on "open licenses".